Unit Conversion Tool - Convert Meters, Feet, Inches, Weight, Temperature and More for Free
Conversion Categories
Choose from our comprehensive collection of conversion tools, organized by category for your convenience.
General Conversions
Essential everyday measurements and units
Convert meters, feet, inches, and more
Convert square meters, acres, hectares, and more
Convert kilograms, pounds, ounces, and more
Convert Celsius, Fahrenheit, Kelvin
Convert liters, gallons, cups, and more
Convert degrees, radians, gradians, and more
Convert seconds, minutes, hours, and more
Convert km/h, mph, m/s, knots, and more
Convert mAh, Ah, Wh, and more
Scientific Conversions
Advanced units for research and engineering
Convert joules, calories, BTU, and more
Convert watts, horsepower, BTU/hour
Convert pascal, bar, PSI, and more
Convert newton-meters, foot-pounds, and more
Convert W/(m⋅K), BTU/(hr⋅ft⋅°F), and more
Convert K/W, °F⋅hr/BTU (IT/th), °F⋅s/BTU (IT/th)
Convert cd/m², nit, lambert, and more
Convert bytes, kilobytes, megabytes, and more
Everyday Conversions
Practical conversions for daily life
Convert clothing sizes worldwide
Convert cooking measurements easily
Convert shoe sizes across regions
Convert MPG, L/100km, and more
Convert A4, Letter, Legal, and more
Convert tire dimensions and specifications
Calculate the difference between two dates in days, weeks, months, or years
Popular Conversions
Quickly jump to the most frequently used unit conversions.
Understanding Unit Conversion Systems
Unit conversion is a fundamental aspect of measurement systems worldwide. The International System of Units (SI) serves as the modern form of the metric system and is the most widely used system of measurement. Understanding different measurement systems and their conversions is essential for various fields, from science and engineering to everyday life.
Key Measurement Systems
Metric System (SI)
- Base units: meter, kilogram, second, ampere, kelvin, mole, candela
- Decimal-based system
- Used in most countries worldwide
- Standard in scientific and technical fields
Imperial System
- Traditional system used in the US and UK
- Units include: inches, feet, yards, miles
- Pounds and ounces for weight
- Gallons and pints for volume
Common Conversion Categories
| Category | Common Units | Applications |
|---|---|---|
| Length | Meters, feet, inches, yards | Construction, engineering, everyday measurements |
| Weight | Kilograms, pounds, ounces | Cooking, shipping, health monitoring |
| Temperature | Celsius, Fahrenheit, Kelvin | Weather, cooking, scientific research |
Our conversion tools are designed to handle all these categories and more, providing accurate and instant conversions between different units of measurement. Whether you're working on a scientific project, planning a recipe, or simply need to convert measurements for everyday use, our tools make the process simple and reliable.
General Conversion Questions
Everything you need to know about unit conversions and measurement systems
What is the metric system and why is it important?
The metric system, also known as the International System of Units (SI), is based on powers of 10, making calculations easier. It's used by nearly every country worldwide because of its simplicity, consistency, and scientific precision. The system includes meters for length, kilograms for mass, seconds for time, and derived units for other measurements.
How accurate are these conversion calculations?
Our conversions use internationally recognized conversion factors and are accurate to many decimal places. However, for critical applications (scientific research, engineering, medical), always verify the precision requirements. Some conversions involve rounding, and the results shown are suitable for everyday use, education, and most professional applications.
What's the difference between imperial and metric units?
Imperial units (used primarily in the US) have specific conversion factors to metric units. Metric units are based on powers of 10, while imperial units have more complex relationships. Key conversions include: 1 inch = 2.54 cm, 1 pound = 0.453592 kg, 1 gallon (US) = 3.78541 liters.
Why do some countries use different measurement systems?
Measurement systems evolved independently based on local needs and traditions. The US primarily uses imperial units due to historical reasons, while most of the world adopted the metric system for its simplicity and international standardization. Some countries use mixed systems depending on the context.
How do I know which unit is appropriate for my needs?
Choose units based on your context: metric for scientific work and international communication, imperial for certain US applications, and specialized units for specific industries. Our converters help you work with any system and convert between them seamlessly.
Can I use these conversions for professional or commercial purposes?
Yes, our conversions are suitable for most professional applications. However, for critical measurements in engineering, medical, or legal contexts, always verify results with official standards and consider the precision requirements of your specific application.
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Further Reading & Useful Resources
Explore these trusted resources to deepen your understanding of measurement systems and unit conversions.